Exams & Certification
If 2 cats kill 2 rats in 2 minutes, then how many cats will it take to kill 10 rats in 10 minutes? The correct answer and explanation is: The answer is 2 cats. Explanation: The problem presents the idea that 2 cats can kill 2 rats in 2 minutes. This means that each cat […]
What is the chemical formula for chromium(II) bromide? The correct answer and explanation is: The chemical formula for chromium(II) bromide is CrBr₂. Chromium(II) refers to the oxidation state of chromium in this compound, which is +2. Bromide, the anion, has a charge of -1. To achieve electrical neutrality in the compound, two bromide ions are
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Write the equation when solid chromium (II) bromide is put into water. The correct answer and explanation is: When solid chromium(II) bromide (CrBr₂) is placed into water, it dissociates into its ions. The dissociation reaction is represented by the following equation: CrBr2(s)→Cr2+(aq)+2Br−(aq)\text{CrBr}_2 (s) \rightarrow \text{Cr}^{2+} (aq) + 2\text{Br}^- (aq) Explanation: Chromium(II) bromide, CrBr₂, is an
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If a person weighs 125 lbs, how many kilograms (kg) do they weigh? The correct answer and explanation is: To convert pounds to kilograms, you need to use the conversion factor where 1 pound is equal to 0.453592 kilograms. So, for a person who weighs 125 lbs, the calculation is: 125 lbs×0.453592 kglb=56.699 kg125 \, \text{lbs} \times 0.453592
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One frustration with research is its lack of definitiveness, which can be linked to the fact that A. there are too few participants in research studies, thus reducing statistical power. B. educational research questions are too value-laden to make sense until many years after that generation of researchers has retired. C. there are too few
Which component of amino acids makes them different from one another? The amino group The central carbon The carboxylic group The side chain (R) The correct answer and explanation is: The correct answer is: The side chain (R). Amino acids are the building blocks of proteins and have a similar core structure, consisting of a
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Indicate how the concentration of each species in the chemical equation will change to reestablish equilibrium after changing the concentration of the reactant or product: An up arrow indicates an increase in concentration, a down arrow indicates a decrease in concentration, and leaving it blank means there is no change in the concentration. C2H4(g) +
Which of the following is a reasonable criticism of Piaget’s theory of cognitive development in children? a. It was based on Eastern philosophy of how kids should be raised by their parents. b. The theory often underestimate’s children’s abilities. c. It was dependent entirely on the environment in which a child was raised and disregarded
All the modern maize (corn) was descended from the domestication of a. Kernel b. Zea mays c. Teosinte d. Balsas The correct answer and explanation is: The correct answer is c. Teosinte. Teosinte is a wild grass native to southern Mexico, and it is considered the ancestor of modern maize (corn). The domestication of maize
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If you shop for a car online and compare car prices across dealerships, money is functioning as a A. medium of exchange. B. means of payment. C. barter mechanism. D. store of value. E. unit of account. The correct answer and explanation is: The correct answer is E. unit of account. Explanation: When you compare